Affiliation: | 1. Department of Internal Medicine, Division of Gastroenterology and Hepatology, Iwate Medical University, , Iwate;2. Department of Gastroenterology, Tokusyukai Kishiwada Hospital, , Osaka;3. Department of Digestive Disease Information and Research and Medicine, Kurume University School of Medicine, , Fukuoka;4. Department of Gastroenterology, Nippon Medical School, , Tokyo;5. Department of Gastroenterology and Hepatology, Mie University Graduate School of Medicine, , Mie;6. Department of Gastroenterology and Hepatology, Yamaguchi University, , Yamaguchi;7. Department of Gastroenterology, Gifu University, , Gifu;8. Division of Medicine and Clinical Science, Tottori University School of Medicine, , Tottori;9. Social Insurance Shimonoseki Kosei Hospital, , Yamaguchi, Japan |